MikeMcl/big.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

5194 stars · 413 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

big.js is a small, fast JavaScript library for arbitrary-precision decimal arithmetic, exporting a single immutable Big number constructor with a simple chained API. It works in all browsers and Node/Deno environments with no dependencies.

Use cases

• avoid floating-point errors like 0.3 - 0.1 in JavaScript
• do precise decimal arithmetic for money and prices
• handle numbers with more than 15 significant digits
• round and format decimals with controlled decimal places
• parse and compute with numbers in exponential notation

When to choose

• you need a tiny (~6 KB), dependency-free decimal math library
• you only need basic arithmetic, rounding, and comparison on decimals
• you want broad browser compatibility including legacy environments
• you prefer a simple API over heavyweight BigDecimal ports

When to avoid

• you need non-decimal bases, NaN/Infinity, or advanced math functions like trigonometry
• you need binary floating-point semantics rather than decimal
• you need very large exponent ranges beyond the recommended magnitude of 1,000,000
• you need integer-only arbitrary precision, where BigInt may suffice

Facets

library · maturity stable

math serialization developer-tools web-development browser cross-platform arbitrary-precision decimal-arithmetic bignumber floating-point no-dependencies algorithms nodejs deno

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